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Trim 9mm Brass?

Discussion in 'Handloading and Reloading' started by TenDriver, Apr 26, 2014.

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  1. TenDriver

    TenDriver Member

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    I don't trim straight wall pistol brass, but saw today in Lyman #49 where they say you should trim 9mm since it head spaces off the mouth.

    Anyone do this?
     
  2. Vodoun da Vinci

    Vodoun da Vinci Member

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    I'm a relative newbie with 9mm and have some cases that have been reloaded 5X now. They have not grown and do not need trimmed. So, no, I don't/have never trimmed 9mm brass.

    VooDoo
     
  3. fallout mike

    fallout mike Member

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  4. M1key

    M1key Member

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    I measure them before loading and toss ones that are worn out or too long. I would never bother to trim them simply because I have buckets of brass.

    M
     
  5. rcmodel

    rcmodel Member in memoriam

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    Not in 50 years I haven't.

    I trim Magnum revolver brass to get consistent crimps.

    Never trimmed an auto-pistol case in my life.

    Because it simply isn't necessary.

    rc
     
  6. loose noose

    loose noose Member

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    No, I don't trim pistol brass that is designed for a semi-auto.
     
  7. BYJO4

    BYJO4 Member

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    It's not necessary to trim 9MM. If you want to and have the time, go ahead as it can't hurt anything.
     
  8. Gadawg88

    Gadawg88 Member

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  9. Otto

    Otto Member

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    Lyman does not say that you should trim 9mm brass. It says cases trimmed should be uniformed and accurate because it head spaces off the mouth.
     
  10. sappyg

    sappyg Member

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    I trim mine only because they could wind up in a glock. Haven't been willing to take a chance on a long or fat round firing out of battery.

    Any thoughts on specically loading 9mm for Glocks?
     
  11. rcmodel

    rcmodel Member in memoriam

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    No.

    In spec 9mm is 9mm.

    If it's safe to fire in any gun, it's safe to fire in a Glock too.

    rc
     
  12. RussellC

    RussellC Member

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    I have reloaded a ton of 9mm rounds for Glocks, dont trim it, no problems....headspacing off case mouth notwithstanding......

    Russellc
     
  13. Blue68f100

    Blue68f100 Member

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    No, never have in nearly 40 yrs.
     
  14. jmorris

    jmorris Member

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    Nope, and have shot well over 100,000 of them through Glocks alone.
     
  15. oldreloader

    oldreloader Member

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    Mine shrink instead of grow
     
  16. gamestalker

    gamestalker member

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    Of all the reloaders I know, and I do know a good few, I'm probably the only one who trims everything I load.

    As for whether or not they stretch, with my loads, at the pressures I work around, yes they do grow, and so much so, that I often find them to be more than .010" beyond SAAMI max after the first firing. This is with 9mm and .40 though and wheel gun brass.

    GS
     
  17. ArchAngelCD

    ArchAngelCD Member

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    In reality most times straight walled pistol brass will shrink slightly when shot and reloaded.
     
  18. TenDriver

    TenDriver Member

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    You're correct. I misread that.
     
  19. Mwaves

    Mwaves Member

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    No need to trim. I asked the same question when I started reloading 9mm. Everyone basically said the same as here. Now I just toss them out if I find a long one.
     
  20. gamestalker

    gamestalker member

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    Mwaves, why toss a long one out vs just trimming it? It's still a good piece of brass.

    GS
     
  21. nix4me

    nix4me Member

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    No trim. Shoot until they split.
     
  22. tightgroup tiger

    tightgroup tiger Member

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    I have never seen a 9mm that was over maximum length to begin with.
    No, I don't trim them. I do pick out anything under .740"in length.
    I use the short ones for shooting in places where I don't get the cases back or for chump giveaways.
     
  23. joneb

    joneb Member

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    I do to make 9x18, I try to recover it all......;)if you are loading free range brass it would be good to check the length.
     
  24. Kurastduuks

    Kurastduuks Member

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    Only handgun brass I trim is magnum loads or target revolver ammo. Never had a need to in 9mm
     
  25. gamestalker

    gamestalker member

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    Aside from the debate of whether they do, or don't stretch, I have always felt that keeping handgun brass trimmed to the same lengths helps to eliminate issues with inconsistent crimps.

    Like many, I have a source for positively once fired factory brass. Often I will find a good deal that is over the SAAMI max, or very close to max, but rarely do I come across anything shorter than SAAMI minimum. And those pieces that I trim to SAAMI trim too length, they have always stretched several thousandths on the first or second time reloaded, but little if any change beyond that point.

    Like I said earlier though, this is with the loads I shoot, and from the firearms I shoot them through. Which is to say, I load and shoot mostly high pressure Longshot loads worked up to no less than published maximum. I also don't crimp my cartridges at all, I don't bell the case mouths, and I only load with jacketed bullets, if it matters.

    GS
     
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